Engraving-machine.



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Patented Dec. 6, 1910.

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ENGRAVING-MACHINE.

Specification of Letters Patent.

Patented Dec. 6, 1910.

Application filed March 9, 1908. Serial No. 419.947.

To all whom it may concern:

Be it known that I, VINCENT LE COMTE OURDAN, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain new and useful Improvements in Engraving-Machines, of which the following is a specification.

My invention relates to engraving machines and consists more particularly in a machine for ngraving lines at right angles on plates used for printing maps and charts.

The principal object of my invention is to provide a machine by which lines of latitude and longitude can be accurately and quickly engraved at right angles to each other, and the construction and method of use of the machine will now be described, reference being had to the accompanying drawing, in which Figure 1 is a plan view of the machine, Fig. 2 isv an isometric view of one end of the bridge and part of one of the ways, Fig. 3 is a central vertical section through the turntable atthe intersection of two of the ways, Fig. 4 is a central vertical section through the tool carriage, and Fig. 5 is an end view of said carriage, the bridge being shown in section.

The machine, which rests on a table or base 1, consists of four tracks or ways 3, 4, arranged to form a square and secured exactly at right angles to each other. The tracks 3, 3, which intersect at one of the corners of the square, are formed of one flat way and one V-way, while the tracks 4, 4, consist of two fiat ways, as shown. In each of the four tracks the space between the two ways contains a rack 5, and on the flange or base of the track outside of the ways is mounted a scale 6, graduated in inches or meters, which scales are removable so as to be replaced by others bearing special graduations of latitude for charts of different scales of nature. Preferably these scales are carried by spools 60, one of which is indicated in F ig. 2, so that the scales can be moved longitudinally, in order to bring. different portions of their graduations into operative posit-ion.

At the intersection of the tracks 3, 3, is a turntable 7, carrying ways which are a continuation of the ways of either one of said tracks 3, 3, and mounted in a spherical socket 8, so as to be capable of rotation and oscillation in any direction.

Slidably mounted on the tracks 3, 4, is the bridge 10, on which in turn slides the toolcarriage 11. Each end of the bridge is carried by a shoe or slide 12, fitted to the ways 3 or 4, and provided with a set-screw 12, by which it can be clamped to said ways. Each end of the bridge is laterally adjustable on said shoe or slide by means of the screw 13, secured against longitudinal movement in the bridge and engaging tapped holes in lugs 14 on said shoe, and which is provided with a knurled head. The front faces of the ends of the bridge carry vernier' scales 15, adjacent to the scales 6 on the ways, by which the position of the bridge can be accurately determined and adjusted. The bridge is also provided throughout its length with a scale 14, graduated in inches or meters. Mounted on each end of the bridge is a pinion 16, which mesh with the racks 5, said pinions being mounted on a shaft 17, running the length of the bridge and suitably journaled thereon, and provided at each end with a handle or handwheel 18, by which it may be rotated.

The carriage 11 is moved back and forth on the bridge by means of the cord or chain 19, which passes around the pulleys 20, mounted on the ends of the bridge and provided with handles for rotation. The ends of the cord are not attached directly to the carriage but to a block 21, slidably mounted for limited longitudinal movement in a groove or way on the carriage. One end of the block 21 is beveled, as shown at 21, for a purpose to be explained. Adjustably mounted on the bridge is a chuck or stop 22, to limit the movement of the carriage in one direction.

The engraving-tool 23 is carried in a toolclamp 24 on the depending portion 25 of a rectangular frame 26 pivoted near two of its corners on the carriage 11. Cross-bar 27 of said frame is beveled underneath, and the block 21 can slide underneath said cross bar and thus swing the frame upwardly on its pivots. Thus when either pulley 20 is rotated in one direction, the effect is to move the block 21 in its ways, raising the free end of the frame 26 and then, as soon as said block reaches the end of its guideway, to pull the carriage along the bridge. WVhen the motion is reversed, the effect is to lower the frame, and consequently let the tool rest on the plate, and then to pull the carriage back. This provides an automatic relief for the tool, obviating the necessity of raising it by handand securing it in an elevated position during the return stroke of the tool. The depth of cut made by the tool is regulated by removable weights 30, mounted on a standard on the frame 26. Additional means are provided for raising the tool from the work at any point in its traverse, which means is operable from either end of the machine. ment and the automatic relief just described is a great convenience, for the machine is approximately six feet square and the en graver would otherwise have to keep walking up and down to reach the various controlling means. The form of means which I have shown for the purpose of raising the tool at any point required, consists in a cam-rod 31, having cylindrical journals 32 at each end, by which it is pivotally mounted on the ends of the bridge. Said rod passes under the cross-bars of the frame 26, which, consequently is raised or lowered by turning said rod, which is provided at both ends with handles 33 for that purpose. It is often necessary to leave a gap in a line of latitude or longitude where a name or other symbol occurs, and the means just described provides a convenient way of accomplishing this.

The operation of engraving the lines of latitude and longitude on a plate with this machine may be briefly described as follows :The plate to be engraved is laid on the table with one edge against a gage or line, and the tool-carriage is run toward one end of the bridge for the required distance whereupon the stop 22 is placed against the carriage and clamped to the bridge so that the pointof the tool lies at the proper distance from the edge of the plate for the marginal lines. A reading of the scale at one end of the bridge is taken and if the other end is not exactly at the same point, it is adjusted by the screw 13, so as to bring the bridge exactly at a right angle to the ways on which it slides. The carriage is then run along the bridge up against the stop 22. during which movement the tool is relieved by the block 21. Upon the return movement the line is engraved. The bridge is then moved along the ways the distance for the next parallel line and, after adjustment if necessary, another line is engraved. hen necessary to leave a gap in a line. the cam-rod 31 is turned to raise the tool-fran'ie while the carriage is moved for the width of the gap. After all the lines running one way have been engraved, the bridge is run with one end of the turntable, the other end is raised, swung around through 90 and lowered onto the other track 4. The lines running at right angles to the lines already engraved This arrangeare then put in in the same way as the first lines, and are surely exactly at right angles to them.

Having thus described my invention, what I claim is:

1. A machine for engraving series of parallel lines at right angles to each other, comprising two pairs of parallel guideways forming a square, a turntable at the intersection of two of said guideways, a bridge slidably mounted on two of said guideways, and a tool-carriage slidably mounted on said bridge.

2. A machine for engraving series of parallel lines at right angles to each other, comprising two pairs of parallel guideways forming a square, a turntable at the inter section of two of said guideways, a bridge slidably mounted on two of said guideways, means operable from either end of said bridge to move the same along said guideways, a tool-carriage movable along said bridge, and means operable from either end of the same to move said carriage.

3. A machine for engraving series of parallel lines at right angles to each other, comprising two pairs of parallel guideways forming a square, a turntable mounted for oscillation vertically and horizontally at the intersection of two of said ways, a shoe or slide mounted on each of one pair of parallel ways, a bridge supported at its ends on said shoes or slides, means to adjust the ends of said bridge laterally on the same, and a tool-carriage slidably mounted on said bridge.

1-. A machine for engraving series of parallel lines at right angles to each other, comprising two pairs of parallel guideways forming a square, each of said ways being provided with a rack and with a scale, a turntable at the intersection of two of said ways, a shoe or slide mounted on each of one pair of parallel ways, means to clamp said shoes or slides to the ways, a bridge supported at its ends on said shoes or slides, a vernier scale on each end of said bridge adjacent to the scales on the ways, means to adjust and secure each end of the bridge on its shoe or slide, a shaft journaled on said bridge, gears on said shaft meshing with said racks and handles on each end of said shaft, a tool-carriage on said bridge and means operable from either end of the same to reciprocate said carriage along said bridge.

5. A machine for engraving series of parallel lines at right angles to each other, comprising two pairs of parallel guideways forming a square, each of said ways being provided with a rack and with a scale, a turntable at the intersection of two of said ways, a shoe or slide mounted on each of one pair of parallel ways, means to clamp said shoes or slides to the Ways, a bridge supported at its ends on said shoes or slides, a Vernier scale on each end of said bridge adjacent to the scales on the ways, means to adjust and secure each end of the bridge on its shoe or slide, a shaft journaled on said bridge, gears 011 said shaft meshing with said racks and handles on each end of said shaft, a tool-carriage on said bridge and provided with a vernier scale, a scale on said bridge with which said Vernier cooperates, a hand-pulley on each end of said bridge and a cord or chain connected at one point to said carriage and passing around said pulleys.

6. In a machine of the class described, the combination with the laterally movable bridge and the carriage slidable thereon, of a frame pivoted on said carriage and carrying the engraving-tool, a cord or chain operable from either end of the bridge to slide said carriage back and forth thereon, a block to which the ends of said cord or chain are attached slidably mounted between stops on said carriage, one end of said block being beveled and passing underneath a part of said frame, whereby the tool is either raised or lowered before the carriage starts to move. 4

7. In a machine of the class described, the combination with the laterally movable bridge and the carriage slidable thereon, of a toolholder pivoted on said carriage, means operable from either end of the bridge to first raise or lower the tool and then move the carriage along the bridge, and additional means operable from either end of the bridge to raise or lower the tool at will.

8. In a machine of the class described, the combination with the laterally movable bridge and the carriage slidable thereon, of a tool-holder pivoted on said carriage, means operable from either end of the bridge to first raise or lower the tool and then move the carriage along the bridge, and a cam-rod journaled on and operable at either end of said bridge to raise or lower the tool at any time.

9. In a machine of the class described, two pairs of parallel ways, a bridge slidable on either pair, a turntable at the intersection of two of said ways whereby said bridge can be transferred from one pair of the ways to the other pair, racks on said ways, gears in mesh with said racks and means on said bridge to rotate said gears, a tool-carriage slidably mounted on said bridge, means on the latter to move said carriage, said means being constructed and arranged to first raise or lower said tool, and additional means on said bridge to raise or lower said tool at any point in its traverse.

the

10. In a machine of the class described, parallel vrays, shoes slidable thereon,means to clamp said shoes to said ways, a bridge carried at its ends on said shoes, scales on said ways, cooperating Vernier scales on the ends of said bridge, screws for adjusting the ends of the bridge on said shoes, a scale on said bridge, a carriage slidable on said bridge and provided with a cooperating vernier scale, a cord or chain operable from either end of the bridge to slide said carriage back or forth thereon, said cord or chain having a lost-motion connection with the carriage, a tool-holder pivoted on said carriage, said lost-motion connection acting to first raise or lower said tool-holder before the carriage is moved, and a cam-rod journaled on said bridge and arranged to lower or raise said tool-holder when turned.

11. In a machine of the class described, the combination with the parallel ways and bridge, of a carriage slidable on said bridge, a tool-frame pivoted thereon, a slide on said bridge passing under the freeend of said frame, a cord or chain connected at its ends to said slide, pulleys mounted on the ends of said bridge around which said cord or chain passes and a cam-rod ournaled on said bridge and also passing under said frame, whereby when either of said pulleys is rotated in one direction the frame is raised to relieve the tool and the carriage is moved backward and when either of said pulleys is rotated in the other direction the frame is lowered and the carriage is moved to engrave a line.

12. A machine for engraving series of parallel lines at right angles to each other, comprising two pairs of parallel guideways forming a square, each of said ways being provided with a movable scale, a turntable at the intersection of two of said ways, a bridge mounted to slide on either opposite pair of said guideways, a tool-carriage on said bridge, and means to move said carriage along said bridge.

13. In a machine of the class described, the combination with the parallel guideways and a tool-carrying bridge slidably mounted therein, of scales mounted adjacent to said guideways, rotatable spools carrying said scales, mounted in the ends of said guideways, and a cooperating scale on each end of said bridge.

In testimony whereof I have afiixed my signature, in presence of two witnesses.

VINCENT LE COMTE OURDAN.

WVitnesses HOWARD A. CooMBs, FimNcIs S. MAGUIRE. 

